package com.v5ent.xoss.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

import org.apache.commons.io.FileUtils;

public class CodeImage {
    private BufferedImage image;// 图像
    private String key;// 验证码

    private CodeImage() {
        init();// 初始化属性
    }

    /*
     * 取得CodeImage实例
     */
    public static CodeImage Instance() {
        return new CodeImage();
    }

    /*
     * 取得验证码图片
     */
    public BufferedImage getImage() {
        return this.image;
    }

    /*
     * 取得图片的验证码
     */
    public String getKey() {
        return this.key;
    }

    private void init() {
        // 在内存中创建图象
        int width = 85, height = 20;
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        // 获取图形上下文
        Graphics g = image.getGraphics();
        // 生成随机类
        Random random = new Random();
        // 设定背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        // 设定字体
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }
        // 取随机产生的认证码(4位数字)
        String sRand = "";
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            // 将认证码显示到图象中
            g.setColor(new Color(20 + random.nextInt(110), 20 + random
                    .nextInt(110), 20 + random.nextInt(110)));
            // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
            g.drawString(rand, 13 * i + 6, 16);
        }
        // 赋值验证码
        this.key = sRand;

        // 图象生效
        g.dispose();
        
        try {
        	String parent = CodeImage.class.getClassLoader().getResource("").getPath()+"../../";
        	File f = new File(parent+File.separator+"images");
        	if(!f.exists()){
        		FileUtils.forceMkdir(f);
        	}
            ImageIO.write(image, "JPEG", new File(parent+File.separator+"images"+File.separator+key+".jpg"));
        } catch (Exception e) {
            System.out.println("验证码图片产生出现错误：" + e.toString());
        }

        this.image = image;/* 赋值图像 */
    }

    /*
     * 给定范围获得随机颜色
     */
    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}